#include<stdio.h>
int main(){
    int a,b,c;
    
    scanf()"%d %d %d",&a,&b,&c);
    
    if(a <=0||b <=0||c <=0){
    printf("Invalid Input");
    }
    
    else if(a == b && b == c){
    printf("Equilateral")
    }
    
    else if(a==b||b==c||a==c){
    printf("Isosceles");
    }
    
    else{
    print("Scalene");
    }
    
    return 0;
}